EMX, EMXO and EMXGO SERIES WATER BOILERS
34-503 07/13
11
14 START-UP PROCEDURES
WARNING: Start-up should only be performed by a qualified technician.
CAUTION: Do not relight pilot or start burner with combustion chamber full of gas vapor, or with very
hot combustion chamber.
1. Study the Installation & Maintenance manual for the burner carefully.
2. Fill the boiler tank with water. Open the relief valve to allow air in the tank to escape. Be sure all
connections into the tank are tight, as leaks at tank fittings will damage the insulation.
3. Follow the enclosed warnings on the water temperature control when setting the operating thermostats.
The boiler has two temperature controls. The top control is the temperature limiting device and should be
set at 250°F. The lowest control is the operating thermostat and must be adjusted 10 degrees below the
temperature limit. A common setting is 160°F for the operating thermostat.
CAUTION:
On models with flue gas recirculation (FGR), the FGR duct and plumbing will be hot during
and after operation. Use care to avoid contact with skin while making adjustments.
4. Conduct the following gas train leakage test before start-up, annual intervals and prior to investigating the
cause of any reported occurrences of delayed ignition.
a. Using an appropriate bubble detection solution, thoroughly coat all gas train pipe connections. If any
bubbles are detected, the leaking connection must be tightened, recoated and rechecked to assure
stoppage of the leak.
b. Attach a manometer, to measure gas pressure, at the manual gas shutoff valve located just upstream
of the gas train. Adjust gas train inlet pressure to the specified value (e.g. 14 in. W.C.), and tightly
close the gas train manual shutoff valve closest to burner.
c. Reattach the manometer to the gas train manual shutoff valve at the burner and record the measured
gas pressure in inches of water column (in W.C.). Measure gas pressure again after 15 minutes. If
gas pressure has increased 0.5" W.C. or more, the gas leak must be isolated to one or more of the
operating gas valves; for example, a solenoid actuated gas shutoff valve. After any leaking valve is
replaced, the reassembled gas train must be leak tested again before start-up is attempted.